Form clamp



Feb. 13. 1,445,286

' G. B. BOSCO FORM CLAMP Filed Apr. l1, 1921 Patented Feb. 13,

marten stares Mtlwdt GEORGE B. 30800, OF CHICAGO, ILLINOIS.

FORM CLAMP.

Application filed April 11, 1921. Serial No. 460,355.

To all whom it may concern:

Be it known that I, GEORGE B. Bosoo, a citizen of the United States of America, and

a resident of Chicago, county of Cook, and State, of Illinois, have invented certain new and useful Improvements in Form Clamps,

of which the following is a specification.

This invention relates to form clamps particularly designed for holdingtogether the separable parts of a concrete moldsuch as those which are used in building concrete columns, joists and girders.

The main objects of this invention are to provide a form clamp which is simple, ineX pensive and effective, and having an improved 'form and arrangement of interlocking parts; to provide improved means for adjusting the parts to accommodate differ ent sizes of molds; and to provide a detachable tool for drawing the interlocking parts toward. each other to tighten the clamp.

An illustrative embodiment of this invention is shownin the accompanying drawin '5, wherein. Y i

i igure 1 is a perspective viewof the form clamp applied to a column mold which is shown partly broken away.

Fig. 2 is a side elevation, partly in section, of the clamp and tool showing the interfitting parts of the clamp in interlocking relation. p

Fig. 3 is afragmentary side elevation. partly in section, showing the detachable tool in its open position.

Fig. 4 is a plan of the interlocking members.

The majority of form clamps which are now in use comprise a plurality of similarly formed sections having means for adjustment at each corner of the clamp. Such clamps cannot properly be applied to a column meld without the services of two men because the clamp sections should be inter locked simultaneously on opposite sides of the mold in order to prevent the form from being distorted.

The present clamp comprises a single flexible band having adjustably secured thereto a pair of members formed for interlocking engagement for securing the band around the form. The interlocking members are drawn together intov locking position by a separate tool which is detachable so that one such tool may serve a large number of 5a clamps.

Referring to the drawings, the clamp is shown applied to a concrete column mold comprising side sections which are formed of planks 1 secured together by battens 2 arranged on the outside of the mold at certain intervals and disposed transversely to the planks.

In the form shown, the clamp comprises a flexible element 3, adapted to embrace the mold and having its ends secured to interlocking members 4: and 5 arranged for telescopic engagement, and which are drawn into interfitting relation by a detachable tool 6.

The flexible element preferably comprises a flat strap of metal, such as spring steel, of sufiicient width to insure a proper grip on the interlocking members.

Extending through one end of each of the interfitting. members, is apair of transversely disposed slots 7, arranged in spaced relation to receive the metal strap. The ends of the strap are laced through the slots 7 in the manner shown in Fig. 2, so as to be secured against slipping by the friction of the overlapping parts. This form of lacing permits the interfitting members to grip the flexible strap at any point along its length, and the clamp is therefore adjustable to accommodate molds of various sizes.

The member 5 is in the form of a flat slide having formed at its outer end a pair of oppositely disposed lugs 8. The member 4 is bifurcated to form a guideway 9 for receiving the slide 5. Formed at the other end of the member 4, is a pair of oppositely disposed lugs 10 arranged adjacent the slots 7. The lugs 8 and 10 are arranged to be engaged by the tool 6 for drawing the interfitting memhere into position to permit their being in terlocked. Extending through the members 4 and 5 is a plurality of apertures 11, ar ranged to receive a locking pin 12, and disposed so as to permit the interlocking of the parts in various relative positions. The looking pin is preferably in the form of a nail which may be driven into the batten of the mold.

The detachable tool comprises a lever arm 13 having arranged at one end thereof oppositely disposed claws 14 and 15 which are pivotally mounted on pins 16 and 17 respectively. The axes of the pivot pins are spaced apart, so that the claws are drawn inwardly toward each other bv the movement of the lever arm in one direction with either one or both ozt'the pinzot pins serving asia lnljeruip for the lever.

In operation, the clamp is applied to a column lnold with the strapen bliacing the battens 2, as shown in Figure 1, any appreciable slack in the strap having first been taken up by adjusting the lacing. The tool 6 is then applied to the members 4: and 5 With the claws engaging the lugs 8 and, 10. op rati g the lever arm the s rap. s t gh n d by aw ng the. nte fitt es members into position to permit the insertion of the pin 12 through certain of tl fi (i-lined apertures T hen the locking; pin has heen'insorted througll the apertures and driven into t QII QkL h detachab etqqlmay e emov and used n t er clamps. A

Wh the lamp is u ed; on ci cular formi u ahlie fills lesks (not shave), be ins rted betwe n; t ijrite tliqqljiill hers and. t efmold,

It is apparent from the foregoing description hat. the present invent on provid s a simple and ef febti e column c amp is whi l l th r are no P iBQ iQg. p rt and hich we be readily applied to mold by one person. A th sh but snesii'fic emh linie'nt of this, nven ion a b n h To S ow: and le cribe r t Will be un ers od. that m e Ousdetai s tthe Qns mmtion sh wn may e alt red r omitted w t ut man gteem th pir t t his mi ntimi s d ined y t o lowing laims- 1 I laim;

' 1. A 'Qrneclamp.wmprisingafiexihle eleme t adapted to emu-me the {f rm nd having: pair. qimem ets mounted hereon-said e bers be ng formed i 3 telescopic s me t and a ing ape tures f li'r c ing a eak n Pil nd a detach lietool tor cl w ng sai me e s is msltm o permit the insertion of said pin into certain of said apertures.

2. A form clamp comprising a flexible element adapted to embrace the "form and having a pair of menihers adjustably mounted thereon, said members being formed for telescopic engagement and having apertures for receiving a locking pin, and a detachable toolfor drawing-said members into position to permit the insertion of said pin into certain oi said apertiires.

3. A form clampcomprisinga flexible'eiement adapted to embracethe form, a pair ot members onsaid} element formed for in,- terlitting engagement, and a detachable tool for drawing said members into interfitting engagement to permit the interlocking of members, said tool comprising a lever ar r i having a pair of oppositely disposed cl a vs pivotally mounted thereon" with the axes of" their pivots spaced apart whereby either of said pivotsis adapted toserve as the fulcrum or said lever. i i

t. A form clamp'comprising a flexible metal strap adapted to 'emhrace the "form I ant lia ine pair f m m di b i mo ntedthereon, said members being formed for telescopic engagement and having aperures amassed t ce e l i s r n ef formed on said members, and a detachable tool OII II QClI to engage said lugs for drawing saild ne nhers into'position to permit the insertion of said pin into certain of sai apertu. ,sa l 1, mer sinea r rm ti 111 pan of oppos tely disposed claws pivotzlly mounted thereon with the axes of their rivets; spaced pa t. wh re y either 013 an pivots, is adapted to serve as the fulcrum of Sa d etter-f Signed at Chicago this 9 day of April, 1 ,214. V V

enonen e Bosoo. 

